Mattress HealthMattresses should be replaced every 7 years if used regularly. However, any of the following indicates the end of it's healthy life; - Sagging along the side or valleys forming in the mattress. - Sounds coming from inside. - Damaged quilted cover or a loss of comfort and support. - It feels lumpy and would be embarrassing if others saw it without covers. - Have you had a better nights sleep in another bed? - Is the bed large enough or would more room be better.